Visualize geometry¶
In vdb_view¶
vdb_view
is a third-party software, which can be found in the libopenvdb-tools package. You can search for detailed usage online.
vdb_view
is a command line utility
> vdb_view geometry.vdb
The grid is shown at the start
![../_images/vdb_view1.png](../_images/vdb_view1.png)
To see geometry press ‘1’ (toggle tree topology view off) and ‘2’ (toggle surface view on) keys on your keyboard.
![../_images/vdb_view2.png](../_images/vdb_view2.png)
Navigate with mouse
In Blender¶
Download Blender (free software) from the official website.
Version 3.1 and above can be used.
Open Blender graphical interface.
Click
geometry.vdb
file.
![../_images/blender11.png](../_images/blender11.png)
Select the initial cube with left mouse click.
On the panel on the bottom right, select
tab. Click![../_images/blender2.png](../_images/blender2.png)
In the Modifier settings, fill in
Object : geometry
Grid Name : FillingFrac
Threshold : 0.5
This will plot the isosurface where FillingFrac
\(=0.5\).
The FillingFrac
grid is filled with scalar values of \(\varphi\), that is, filling fraction.
\(\varphi=1\) in the mesh cells filled with solid or liquid, and \(\varphi=0\) in the empty cells.
Some cells are partially filled. The isosurface where \(\varphi=0.5\) is a good approximation of the metal surface.
![../_images/blender3.png](../_images/blender3.png)
Navigate Viewport with [Numpad .], Middle Mouse, Middle Mouse + Shift, Middle Mouse + Ctrl.
![../_images/blender4.png](../_images/blender4.png)